WAEC Chemistry 2013 Objective — Question 44

Question 44 of 50 from the West African Examinations Council (WAEC) Chemistry 2013 Objective paper, with the correct answer and a full explanation.

A hydrocarbon compound contains 92.3% carbon. Determine its empirical formula. [H = 1.00; C = 12.00]

A. CHCorrect
B. CH2
C. CH3
D. C2H3

Explanation

C = 92.3%, H = 100% − 92.3% = 7.7%. Dividing by atomic mass: C = 92.3/12 = 7.7, H = 7.7/1 = 7.7. Dividing by smallest (7.7): C=1, H=1. Thus, the empirical formula is CH.

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